SSL PKI

We need to be explicit about how our SSL PKI works. Outlining how we can
fit into existing PKI's and how we will auto generate keys for
developers.

There is also a patch which outlines some of the initial changes in
os-cloud-config I4d65cceee9e15ce0ca8ef309127a587135355810.

Change-Id: I32473fe797a4c1e28d14c3b82c8892c7c59a4e55
Merge "SSL PKI"